Propeller.



1 T. AMNELIUS.

PROPELLER.

APPLIoATIoN FILED 11111.14, 1909.

936,508. Patented oct.12,19o9.

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PROPE'LLER.

specification of Letters Patent.' v

Patented Got. 12, 1909.

Application filed January 14,71909. Serial No. 13:72,#326.,l

To all whom it may concern;

Be it knownthat I, THEoDoRE AMNELIUS,

citizen of the United States, residing at South Framingham, inthecounty'of Middlesex and State of Massachusetts, have iii-lV ventedcertain new andfuseful Improvements 1n Propellers; and I doherebydeclare the following to be a full, clear,` and. exact description ofthe invention, such as will enable others skilledinthe art to which itappertains to make and use the same. p

This invention 'relates to propellers designed especially for user onaeroplanes or other forms of airships, but also applicable to anypurpose for which a-propeller may be employed.

The object of the invention is to providea device in which each of theprincipal blades isformed of a plurality of vanes or sub-" bladesarranged in the manner hereinafter4 more fully set forth, in order thatthe eiliciency of such blades and of the propeller as la whole may begreater than in a device in.

which the blades are of ordinary construction.

-In the accompanying drawings: Figure 1l is a plan view of a propellerconstructed in accordance with my invention, and Fig. 2 is a view takenat right` angles to the view shown in Fig. 1. o Referring -to thedrawings in detail, 1 indicates the hub of my improved propeller,

and 2, 3, and 4 designate the vanes or subblades used in theconstruction of each ofthe principal blades. Each sub-blade tapers fromthe innerto the outer end, being wider Aat such outer end, and isconnected vwith the hub at an angle to the main axis of the hub, asshown in the drawin s. The individual sub-blades are given a s ighttwist vin order that the surfaces may be inclined to a greater degreetoward the hub than lat the outer ends, and each sub-blade contacts withthe adjoining sub-blade at given points or rather along given lines, butare separated between these places of contact, permitting of the passage`of the water or air betweenthe blades.

Each vane or sub-blade consists of a plurality of sections 5 6 and 7curved on the arc of a circle, the end of such sections meeting alongthe lines S. The parts 5, 6 and 7 are termed sections for convenience,but it will be understood that each sub-blade is preferably formed inone piece. The correspond- 1ng-sect1ons of vanes 2 and 4 are locatedoppos1te each other, but the sections of vane 3 4iare'so arranged thatthe ends thereof contact withthe middle portion of the archof sections 5aind of member 2, while'the mid- A dl'e portion of the arches of vane-3contacts with the ends of the sections: of vane 4.

The various sub-blades are so' propor' tioned and connected with the hubin such manner thata line joining any point on one edge of' sub-blade 4eand a corresponding point on the oppositeedge of blade 2 would lie in aplane perpendicular to the shaft 15, this line passing through thecentral portion of sub-blade 3.

A propeller constructed in the manner described construct-ion in that itnot only ordinary construction in that it not only produces the usualthrust, but the extent of surface acting on the air, or on the water,-

as the case may be, is materially increased without adding to the lengthor width of the blade. The parachutelikeefl`ect of the sub-blades orvanes, and the grouping of the latter, both contribute to produce thisresult. The spacing of the vanes permits of the passage of air currentsbetween such' vanes so that the several vanes of each principal bladeare acting ,at a given instant upon an independent pendicular to theshaft.

What I claim as new and desire't'o secure Letters Patent on is: l. In apropeller, a hub, a series of prinstratum of air pery cipal bladesconnected therewith, eachl comprising a plurality of sub-blades, eachsub-. blade arranged out of parallel relation with the adjoiningsub-blade and formed with a contact portion whereby said sub-blades arespaced apart for the greater portion of theirA length. 2. In apropeller, a hub, a series of principal blades connected therewith, eachcomprising a plurality of sub-blades the sections of which are curved onthe arc of a circle, each sub-blade being arranged out of parallelrelation with the adjoining subblade. and formed withv a contact portionwhereby such sub-blades are spaced apart for the greater portion'oftheir length.`

3. In a propeller, a hub, a series of principal blades connectedtherewith, each com; prising a plurality of sub-blades formed ofsectipgns curved on the arc of a circle and contacting at intervals onewith the other.

4. In a propeller, a hub, a series of principal blades connectedtherewith, each comprising a plurali-ty of sub-blades, sections of whichpresent a convex surface on one side and a concave surface on theopposite side, the ends of such sections im one subblade arranfedopposite the middle portion of the sections of the adjoining sub-blade.

5. In a propeller, a hub, a series of principalblades connectedtherewith, each comprising a plurality of sub-blades7 the-edge of one ofsaid sub-blades being on a line with the opposite edge of an alternatesubblade comprising a part of the same prin# cipal blade, such linebeing perpendicular to the main axis of the propeller.

6. In a propeller, a hub, a series of'principal blades connectedtherewith, each comprising a plurality of Sub-blades, sections of whichare convex on one face and concave Aon the opposite face, the edge ofone of the sub-blades being on a line 'with the opposite edge.of analternate .sub-blade comprising a part of the same principal blade, suchline being perpendicular to the lnain axis of the propeller. I

7 In a propeller, a hub, a series of principal blades connectedtherewith each comprising a plurality of sub-blades, sections of whichare convex on one face, and concave on the opposite'face, the ends ofsections ot' a given sub-blade arranged Oppssite the .middle portions ofsections of an adjoining Sub-blade, the edge of one of said sub-bladesbeing on a line with the opposite edge of the alternate sub-bladecomprising a portion of the same principal blade, such 'line beingperpendicular to the main axis of the propeller.

In testimony whereof I atix my signature' in presence of two Witnesses.

THEODORE AMNELI'U S. Titnessesz CHARLES F. HATHAWAY, Gro. E. PEOGG.

